Most phones last three to five years before they slow down or the battery stops holding a charge
How long you keep a phone depends on what you use it for, how well you take care of it, and whether the manufacturer still sends security updates. A phone that gets heavy daily use — lots of apps, video, gaming — will wear out faster than one used mainly for calls and texts. The real limit is usually not the hardware breaking, but the battery degrading and the software becoming outdated.
If your phone still gets security updates from the manufacturer and the battery lasts through a full day of normal use, you do not need to replace it yet. If you are charging it twice a day, apps are crashing, or the manufacturer stopped releasing updates more than two years ago, replacement is worth considering.
Key Takeaways
- Battery degradation is the most common reason to replace a phone — when it no longer lasts a full day of normal use, replacement becomes practical.
- Security updates matter more than speed: a slower phone that still receives updates is safer than a fast one that does not.
- Most manufacturers stop sending updates after three to four years, which is when security risks start to accumulate.
- Physical damage, water damage, or a cracked screen can make replacement necessary even if the phone is relatively new.
- Keeping a phone longer than five years is possible but requires accepting slower performance and higher security risk.
When your battery is the real problem
A degraded battery is the most common reason people replace phones that otherwise work fine. Lithium batteries — the kind in every smartphone — lose capacity over time. After two to three years of regular charging, most batteries hold only 80 percent of their original charge. After four years, that drops to 70 percent or lower.
If you are charging your phone twice a day during normal use, or if it shuts down at 20 percent battery even though the battery indicator says it should have more, the battery has degraded enough to affect your daily life. You have two options: replace just the battery (which costs $50 to $150 at an authorized repair shop) or replace the phone. Battery replacement makes sense if the phone is otherwise working well and still receiving updates. If the phone is already three or four years old, replacement is usually the better choice because other parts are likely wearing out too.
Security updates stop, and that matters
Every phone manufacturer sets an end date for security updates. Apple typically supports iPhones for five to six years. Samsung supports most phones for three to four years. Google supports Pixel phones for three years of major updates and four years of security patches. Once updates stop, your phone becomes increasingly vulnerable to security flaws that hackers can exploit.
This does not mean your phone stops working the day updates end. It means that new security problems discovered after that date will not be patched on your device. If you use your phone for banking, email, or shopping, an unpatched phone is a real risk. Check your phone's settings to see when the manufacturer stopped sending updates — if it has been more than two years since the last update, replacement is worth planning for.
Speed and app crashes: when performance becomes unusable
Phones slow down for two reasons: the battery is failing (which you can fix by replacing the battery), or the storage is nearly full. If your phone has less than 10 percent free storage, it will lag noticeably. Delete old photos, videos, and apps you do not use regularly. If you free up storage and the phone still feels slow, the issue is likely the battery or the processor aging.
Apps crashing repeatedly is usually a sign that the phone does not have enough memory to run them, or that the operating system is too old for the app. If crashes happen with apps that worked fine a year ago, the phone is probably due for replacement. If crashes happen only with one or two apps, try uninstalling and reinstalling them first.
Physical damage and water damage
A cracked screen, a dent, or a loose button does not mean you have to replace the phone — these are repairable. A cracked screen costs $100 to $300 to fix depending on the phone model. A loose button or charging port can sometimes be fixed for $50 to $100. Water damage is trickier: if the phone got wet and still turns on, it may work fine for months or years, but corrosion inside can cause problems later.
If the phone got wet and now has display problems, speaker problems, or charging problems, replacement is usually more practical than repair. If it got wet but still works normally, you can keep using it while watching for problems. Back up your data regularly in case it fails suddenly.
Comparing the cost of repair versus replacement
Before you replace a phone, get a repair estimate. A battery replacement costs $50 to $150. A screen repair costs $100 to $300. A charging port repair costs $50 to $100. If the total repair cost is more than half the price of a used phone of the same model in good condition, replacement makes more financial sense.
Used phones of the same model typically cost 30 to 50 percent less than new ones. If your phone is two years old and a battery replacement costs $100, but a used phone of the same model costs $200, the repair is the better choice. If your phone is four years old and a battery replacement costs $150, but a used phone costs $250, the math still favors repair — but you are also keeping a phone that will stop receiving updates soon.
Keeping a phone longer than five years
You can keep a phone longer than five years if you are willing to accept slower performance and higher security risk. Older phones run older operating systems, which means fewer apps will work, and the apps that do work may run slowly. Banking apps, payment apps, and social media apps may stop supporting older operating systems.
If you use your phone mainly for calls, texts, and web browsing on Wi-Fi, an older phone is more practical. If you use it for banking, shopping, or handling sensitive information, the security risk of an unpatched phone outweighs the cost of replacement. A middle ground is to replace the battery and keep the phone for one or two more years while planning to replace it when the next major security issue appears.
Frequently Asked Questions
Is it worth replacing the battery instead of buying a new phone?
Yes, if the phone is less than three years old and still receiving security updates. A battery replacement costs $50 to $150 and can add two more years of usable life. If the phone is four or more years old, replacement is usually better because other parts are wearing out and updates will stop soon.
Can I use a phone after the manufacturer stops sending updates?
Yes, the phone will continue to work, but it becomes less secure over time. New security flaws discovered after updates stop will not be patched. If you use the phone for banking or shopping, this is a real risk. For calls and texts only, the risk is lower.
What should I do if my phone got wet?
Turn it off immediately and let it dry for at least 48 hours in a warm, dry place. Do not charge it or use it during this time. After it dries, turn it on and test the screen, speakers, and charging port. If everything works normally, you can keep using it, but back up your data regularly in case problems develop later.
How do I know if my phone battery is degraded?
On iPhone, go to Settings > Battery > Battery Health. On Android, the process varies by manufacturer — check your phone's settings for "Battery" or "Device Care." If the battery health is below 80 percent and the phone is more than two years old, replacement or repair is worth considering.
Should I buy a new phone or a used one?
A used phone of the same model costs 30 to 50 percent less than a new one and will work just as well if it is in good condition. Buy from a reputable seller and ask about the battery health and whether it still receives updates. A used phone is a good choice if you want to save money and do not need the latest features.